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Pocket Integration
This is mostly everything related to Pocket in the browser. There are a few exceptions, like newtab, some reader mode integration, and some JSWindowActors, that live in other places.
Primarily though this directory includes code for setting up the save to Pocket button, setting up the panels that are used once the Pocket button is clicked, setting up the Pocket context menu item, and a little scaffolding for the reader mode Pocket integration.
Basic Code Structure
We have three primary areas code wise.
There are some JSMs that handle communication with the browser. This includes some telemetry, some API functions usable by other parts of the browser, like newtab, and some initialization and setup code. These files live in /content
There is also some standard js, html, and css that run inside the panels. Panels are the contents inside the drop downs if you click the save to Pocket button. Panels run in their own browser process, and have their own js. This js also has a build/bundle step. These files live in /content/panels. We have three panels. There is a sign up panel that is displayed if you click the save to Pocket button while not signed in. There is a saved panel, if you click the save to Pocket button while signed in, and on a page that is savable. Finally there is a home panel, if you click the save to Pocket button while signed in, on a page that is not savable, like about:home.
Build Panels
We use webpack and node to build the panel bundle. So if you change anything in /content/panels/js or /content/panels/css, you probably need to build the bundle.
The build step makes changes to the bundle files, that need to be included in your patch.
Prerequisites
You need node.js installed, and a working local build of Firefox. The current or active version of node is probably fine. At the time of this writing, node version 14 and up is active, and is recommended.
How to Build
From /browser/components/pocket
If you're making a patch that's ready for review:
run npm install
then npm run build
For active development instead of npm run build use npm run watch, which should update bundles as you work.
React and JSX
We use React and JSX for most of the panel html and js. You can find the React components in /content/panels/js/components.
We are trying to keep the React implementation and dependencies as small as possible.